/*
* Javascript md5() 函数 用于生成字符串对应的md5值
* @param string string 原始字符串
* @return string 加密后的32位md5字符串
*/
function md5(string){
    function md5_RotateLeft(lValue, iShiftBits) {
            return (lValue<<iShiftBits) | (lValue>>>(32-iShiftBits));
    }
    function md5_AddUnsigned(lX,lY){
            var lX4,lY4,lX8,lY8,lResult;
            lX8 = (lX & 0x80000000);
            lY8 = (lY & 0x80000000);
            lX4 = (lX & 0x40000000);
            lY4 = (lY & 0x40000000);
            lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF);
            if (lX4 & lY4) {
                    return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
            }
            if (lX4 | lY4) {
                    if (lResult & 0x40000000) {
                            return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
                    } else {
                            return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
                    }
            } else {
                    return (lResult ^ lX8 ^ lY8);
            }
    }         
    function md5_F(x,y,z){
            return (x & y) | ((~x) & z);
    }
    function md5_G(x,y,z){
            return (x & z) | (y & (~z));
    }
    function md5_H(x,y,z){
            return (x ^ y ^ z);
    }
    function md5_I(x,y,z){
            return (y ^ (x | (~z)));
    }
    function md5_FF(a,b,c,d,x,s,ac){
            a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_F(b, c, d), x), ac));
            return md5_AddUnsigned(md5_RotateLeft(a, s), b);
    }; 
    function md5_GG(a,b,c,d,x,s,ac){
            a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_G(b, c, d), x), ac));
            return md5_AddUnsigned(md5_RotateLeft(a, s), b);
    };
    function md5_HH(a,b,c,d,x,s,ac){
            a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_H(b, c, d), x), ac));
            return md5_AddUnsigned(md5_RotateLeft(a, s), b);
    }; 
    function md5_II(a,b,c,d,x,s,ac){
            a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_I(b, c, d), x), ac));
            return md5_AddUnsigned(md5_RotateLeft(a, s), b);
    };
    function md5_ConvertToWordArray(string) {
            var lWordCount;
            var lMessageLength = string.length;
            var lNumberOfWords_temp1=lMessageLength + 8;
            var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1 % 64))/64;
            var lNumberOfWords = (lNumberOfWords_temp2+1)*16;
            var lWordArray=Array(lNumberOfWords-1);
            var lBytePosition = 0;
            var lByteCount = 0;
            while ( lByteCount < lMessageLength ) {
                    lWordCount = (lByteCount-(lByteCount % 4))/4;
                    lBytePosition = (lByteCount % 4)*8;
                    lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount)<<lBytePosition));
                    lByteCount++;
            }
            lWordCount = (lByteCount-(lByteCount % 4))/4;
            lBytePosition = (lByteCount % 4)*8;
            lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80<<lBytePosition);
            lWordArray[lNumberOfWords-2] = lMessageLength<<3;
            lWordArray[lNumberOfWords-1] = lMessageLength>>>29;
            return lWordArray;
    }; 
    function md5_WordToHex(lValue){
            var WordToHexValue="",WordToHexValue_temp="",lByte,lCount;
            for(lCount = 0;lCount<=3;lCount++){
                    lByte = (lValue>>>(lCount*8)) & 255;
                    WordToHexValue_temp = "0" + lByte.toString(16);
                    WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2);
            }
            return WordToHexValue;
    };
    function md5_Utf8Encode(string){
            string = string.replace(/\r\n/g,"\n");
            var utftext = ""; 
            for (var n = 0; n < string.length; n++) {
                    var c = string.charCodeAt(n); 
                    if (c < 128) {
                            utftext += String.fromCharCode(c);
                    }else if((c > 127) && (c < 2048)) {
                            utftext += String.fromCharCode((c >> 6) | 192);
                            utftext += String.fromCharCode((c & 63) | 128);
                    } else {
                            utftext += String.fromCharCode((c >> 12) | 224);
                            utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                            utftext += String.fromCharCode((c & 63) | 128);
                    } 
            } 
            return utftext;
    }; 
    var x=Array();
    var k,AA,BB,CC,DD,a,b,c,d;
    var S11=7, S12=12, S13=17, S14=22;
    var S21=5, S22=9 , S23=14, S24=20;
    var S31=4, S32=11, S33=16, S34=23;
    var S41=6, S42=10, S43=15, S44=21;
    string = md5_Utf8Encode(string);
    x = md5_ConvertToWordArray(string); 
    a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476; 
    for (k=0;k<x.length;k+=16) {
            AA=a; BB=b; CC=c; DD=d;
            a=md5_FF(a,b,c,d,x[k+0], S11,0xD76AA478);
            d=md5_FF(d,a,b,c,x[k+1], S12,0xE8C7B756);
            c=md5_FF(c,d,a,b,x[k+2], S13,0x242070DB);
            b=md5_FF(b,c,d,a,x[k+3], S14,0xC1BDCEEE);
            a=md5_FF(a,b,c,d,x[k+4], S11,0xF57C0FAF);
            d=md5_FF(d,a,b,c,x[k+5], S12,0x4787C62A);
            c=md5_FF(c,d,a,b,x[k+6], S13,0xA8304613);
            b=md5_FF(b,c,d,a,x[k+7], S14,0xFD469501);
            a=md5_FF(a,b,c,d,x[k+8], S11,0x698098D8);
            d=md5_FF(d,a,b,c,x[k+9], S12,0x8B44F7AF);
            c=md5_FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1);
            b=md5_FF(b,c,d,a,x[k+11],S14,0x895CD7BE);
            a=md5_FF(a,b,c,d,x[k+12],S11,0x6B901122);
            d=md5_FF(d,a,b,c,x[k+13],S12,0xFD987193);
            c=md5_FF(c,d,a,b,x[k+14],S13,0xA679438E);
            b=md5_FF(b,c,d,a,x[k+15],S14,0x49B40821);
            a=md5_GG(a,b,c,d,x[k+1], S21,0xF61E2562);
            d=md5_GG(d,a,b,c,x[k+6], S22,0xC040B340);
            c=md5_GG(c,d,a,b,x[k+11],S23,0x265E5A51);
            b=md5_GG(b,c,d,a,x[k+0], S24,0xE9B6C7AA);
            a=md5_GG(a,b,c,d,x[k+5], S21,0xD62F105D);
            d=md5_GG(d,a,b,c,x[k+10],S22,0x2441453);
            c=md5_GG(c,d,a,b,x[k+15],S23,0xD8A1E681);
            b=md5_GG(b,c,d,a,x[k+4], S24,0xE7D3FBC8);
            a=md5_GG(a,b,c,d,x[k+9], S21,0x21E1CDE6);
            d=md5_GG(d,a,b,c,x[k+14],S22,0xC33707D6);
            c=md5_GG(c,d,a,b,x[k+3], S23,0xF4D50D87);
            b=md5_GG(b,c,d,a,x[k+8], S24,0x455A14ED);
            a=md5_GG(a,b,c,d,x[k+13],S21,0xA9E3E905);
            d=md5_GG(d,a,b,c,x[k+2], S22,0xFCEFA3F8);
            c=md5_GG(c,d,a,b,x[k+7], S23,0x676F02D9);
            b=md5_GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A);
            a=md5_HH(a,b,c,d,x[k+5], S31,0xFFFA3942);
            d=md5_HH(d,a,b,c,x[k+8], S32,0x8771F681);
            c=md5_HH(c,d,a,b,x[k+11],S33,0x6D9D6122);
            b=md5_HH(b,c,d,a,x[k+14],S34,0xFDE5380C);
            a=md5_HH(a,b,c,d,x[k+1], S31,0xA4BEEA44);
            d=md5_HH(d,a,b,c,x[k+4], S32,0x4BDECFA9);
            c=md5_HH(c,d,a,b,x[k+7], S33,0xF6BB4B60);
            b=md5_HH(b,c,d,a,x[k+10],S34,0xBEBFBC70);
            a=md5_HH(a,b,c,d,x[k+13],S31,0x289B7EC6);
            d=md5_HH(d,a,b,c,x[k+0], S32,0xEAA127FA);
            c=md5_HH(c,d,a,b,x[k+3], S33,0xD4EF3085);
            b=md5_HH(b,c,d,a,x[k+6], S34,0x4881D05);
            a=md5_HH(a,b,c,d,x[k+9], S31,0xD9D4D039);
            d=md5_HH(d,a,b,c,x[k+12],S32,0xE6DB99E5);
            c=md5_HH(c,d,a,b,x[k+15],S33,0x1FA27CF8);
            b=md5_HH(b,c,d,a,x[k+2], S34,0xC4AC5665);
            a=md5_II(a,b,c,d,x[k+0], S41,0xF4292244);
            d=md5_II(d,a,b,c,x[k+7], S42,0x432AFF97);
            c=md5_II(c,d,a,b,x[k+14],S43,0xAB9423A7);
            b=md5_II(b,c,d,a,x[k+5], S44,0xFC93A039);
            a=md5_II(a,b,c,d,x[k+12],S41,0x655B59C3);
            d=md5_II(d,a,b,c,x[k+3], S42,0x8F0CCC92);
            c=md5_II(c,d,a,b,x[k+10],S43,0xFFEFF47D);
            b=md5_II(b,c,d,a,x[k+1], S44,0x85845DD1);
            a=md5_II(a,b,c,d,x[k+8], S41,0x6FA87E4F);
            d=md5_II(d,a,b,c,x[k+15],S42,0xFE2CE6E0);
            c=md5_II(c,d,a,b,x[k+6], S43,0xA3014314);
            b=md5_II(b,c,d,a,x[k+13],S44,0x4E0811A1);
            a=md5_II(a,b,c,d,x[k+4], S41,0xF7537E82);
            d=md5_II(d,a,b,c,x[k+11],S42,0xBD3AF235);
            c=md5_II(c,d,a,b,x[k+2], S43,0x2AD7D2BB);
            b=md5_II(b,c,d,a,x[k+9], S44,0xEB86D391);
            a=md5_AddUnsigned(a,AA);
            b=md5_AddUnsigned(b,BB);
            c=md5_AddUnsigned(c,CC);
            d=md5_AddUnsigned(d,DD);
    }
return (md5_WordToHex(a)+md5_WordToHex(b)+md5_WordToHex(c)+md5_WordToHex(d)).toUpperCase();
}

module.exports = {
  md5:md5
}